[TenTec] QSK with QSK-5PC

[al_lorona at agilent.com]

Is it full QSK?

Al W6LX



> -----Original Message-----
> From: tentec-bounces at contesting.com
> [mailto:tentec-bounces at contesting.com]On Behalf Of Steve N4LQ
> Sent: Tuesday, November 09, 2004 4:39 PM
> To: tentec at contesting.com
> Subject: Re: [TenTec] QSK with QSK-5PC
> 
> 
> Phil et al.
> Just to clear up any confusion. I got home from work and checked the 
> schematic on this mod. The T voltage is being uses, derived 
> from connector 
> 61 on the control board. This is driving Q16 which has been 
> changed to a 
> 2N5554. The emitter remains grounded and the collector runs 
> directly to J7, 
> the relay output. This is what keys my amp.
> 
> Steve N4LQ
> ----- Original Message ----- 
> From: <al_lorona at agilent.com>
> To: <tentec at contesting.com>
> Sent: Tuesday, November 09, 2004 1:01 PM
> Subject: RE: [TenTec] QSK with QSK-5PC
> 
> 
> 
> Hi, Steve,
> 
> I believe I know why the previous owner did that to your Omni 
> VI. (And I'm 
> assuming you care!)
> 
> Last night I made some measurements of the TX Enable signal 
> on the back 
> panel of the Omni VI. This line goes low at the beginning of 
> a dit or a dah, 
> then the RF comes on, just as it should. There is no problem 
> at the leading 
> edge.
> 
> The problem is at the trailing edge. The TX Enable goes high 
> again, but the 
> RF doesn't shut off immediately, so there is a period of time 
> when the QSK 
> circuit in the amp is being told to go back to receive, yet 
> there is still 
> RF flowing. This is the problem.
> 
> What is needed is for this signal to stay low just a little 
> bit longer, 
> until the RF ends completely, then it can go high again to 
> turn the diodes 
> in the QSK unit back to receive. There is a signal that will 
> do that in the 
> Omni; it's called the relay, and that explains why your 
> previous owner used 
> this signal. This is the line that is affected by the front panel DLY.
> 
> I think I am going to do the same as your previous owner. 
> That is, I'm going 
> to bring out a line from the relay switching transistor, Q16 
> on the control 
> board, bypass the relay, and use that as my QSK line. I don't 
> know if it 
> will work yet, but that is my next plan.
> 
> True QSK or full QSK, whatever you want to call it, is really hard to 
> achieve with an amplifer. The way you guys speak about  QSK on the 
> reflector, you aren't happy unless you can hear the band 
> between dits at 50 
> wpm, but that just isn't possible between an Omni and a cheap 
> amp like an 
> Ameritron, even with the QSK switch. About the only advantage 
> the QSK switch 
> affords you is the elimination of the mechanical relay in the amp.
> 
> Anyway, that's the way I see it. Thanks again for the 
> information you gave 
> me.
> 
> Regards,
> 
> Al  W6LX
> 
> 
> 
> 
> > -----Original Message-----
> > From: tentec-bounces at contesting.com
> > [mailto:tentec-bounces at contesting.com]On Behalf Of Steve N4LQ
> > Sent: Monday, November 08, 2004 5:54 PM
> > To: tentec at contesting.com
> > Subject: Re: [TenTec] QSK with QSK-5PC
> >
> >
> > Al. Whatever you do, call MFJ before you hook that thing up.
> > I didn't  and
> > blew diodes out of a rig. My QSK was external which made it 
> even more
> > complicated.
> > I can tell you this....The previous owner of my 6+ bypassed
> > the amp relay in
> > the rig and used the txd voltage to drive a little transistor
> > which feeds
> > directly to the amp relay jack. This seems to provide
> > excellent keying for
> > my Icom PW-1 with no sign of hot switching.
> > Steve N4LQ
> > ----- Original Message ----- 
> > From: <al_lorona at agilent.com>
> > To: <tentec at contesting.com>
> > Sent: Monday, November 08, 2004 8:01 PM
> > Subject: [TenTec] QSK with QSK-5PC
> >
> >
> >
> > Would someone who has successfully connected an Omni VI to an
> > Ameritron
> > amplifier equipped with the internal QSK-5PC board be willing
> > to contact me
> > off the list? I want to know how you connected the two.
> >
> > I have read Jim KH7M's previous posts on this subject and
> > they are excellent
> > for the external unit QSK-5, but the connections to the QSK-5PC are
> > different enough that I cannot translate the connections in my head.
> >
> > Interestingly, a search of the Internet yields no information
> > whatsoever on
> > this. I am thinking of using the TX enable input on the back
> > of the Omni to
> > receive a handshaking signal from the QSK-5PC, but I want to talk to
> > somebody who has done this.
> >
> > Thanks.
> >
> > Al  W6LX
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec at contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
> > _______________________________________________
> > TenTec mailing list
> > TenTec at contesting.com
> > http://lists.contesting.com/mailman/listinfo/tentec
> >
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
> 
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>